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lib/nbt: Start implementing the in-memory data structure for NBT

Soda
BodgeMaster 2022-09-15 06:06:47 +02:00
parent ad291ee77d
commit 53878c3e2b
3 changed files with 31 additions and 81 deletions
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2
src/lib/error.hpp
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@ -89,6 +89,8 @@ namespace ErrorCodes {
const uint8_t NOT_YET_KNOWN = 7; const uint8_t NOT_YET_KNOWN = 7;
const uint8_t INVALID_TYPE = 8;
const uint8_t UNIMPLEMENTED = 254; const uint8_t UNIMPLEMENTED = 254;
const uint8_t UNKNOWN = 255; const uint8_t UNKNOWN = 255;

51
src/lib/nbt.cpp
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@ -543,56 +543,15 @@ namespace NBT {
} }
} }
//Tag constructors // generic class that all tag types are derived from
template <typename T> template <typename T>
Tag<T>::Tag(uint8_t tagType, tiny_utf8::string name, uint16_t nameSize, T content, uint32_t size) Tag<T>::Tag() {
: tagType(tagType), name(name), nameSize(nameSize), content(content) ,size(size)
{}
End::End() : Tag::Tag(0, "", 0, 0, 0) {}
Byte::Byte(tiny_utf8::string name, uint16_t nameSize, int8_t content)
: Tag::Tag(1, name, nameSize, content, 1)
{}
Byte::Byte(uint8_t data[]){
if(validate(data)){
this->tagType = 1;
uint8_t nameSizeSlice[] = {data[1], data[2]};
ErrorOr<int16_t> readIntResult = Helper::readInt16(nameSizeSlice, 2, 0);
if(!readIntResult.isError){
this->nameSize = readIntResult.value;
}else{
throw readIntResult.errorCode;
}
uint8_t nameSlice[this->nameSize+2];
for(int i=0; i<this->nameSize+2; i++){
nameSlice[i] = data[i+1];
}
ErrorOr<tiny_utf8::string> readStringResult = Helper::readString(nameSlice, this->nameSize, 0);
if(!readStringResult.isError){
this->name = readStringResult.value;
}else{
throw readStringResult.errorCode;
}
//int8 needs only one byte
this->content = data[this->nameSize+4];
}
} }
//more conditions will be added template <typename T>
bool Byte::validate(uint8_t data[]){ ErrorOr<std::vector<uint8_t>> Tag<T>::toRawData() {
if(data[0] == 0x01){ return ErrorOr<std::vector<uint8_t>>(true, ErrorCodes::INVALID_TYPE);
return true;
}else{
return false;
}
} }
bool validateRawListContents(uint8_t data[], uint64_t dataSize, uint64_t initialPosition, uint64_t* processedDataSize) { bool validateRawListContents(uint8_t data[], uint64_t dataSize, uint64_t initialPosition, uint64_t* processedDataSize) {

59
src/lib/nbt.hpp
View File

@ -72,45 +72,34 @@ namespace NBT {
} }
namespace TagType { namespace TagType {
const uint8_t END = 0; const uint8_t END = 0;
const uint8_t INT8 = 1; const uint8_t INT8 = 1;
const uint8_t INT16 = 2; const uint8_t INT16 = 2;
const uint8_t INT32 = 3; const uint8_t INT32 = 3;
const uint8_t INT64 = 4; const uint8_t INT64 = 4;
const uint8_t FLOAT = 5; const uint8_t FLOAT = 5;
const uint8_t DOUBLE = 6; const uint8_t DOUBLE = 6;
const uint8_t INT8_ARRAY = 7; const uint8_t INT8_ARRAY = 7;
const uint8_t STRING = 8; const uint8_t STRING = 8;
const uint8_t LIST = 9; const uint8_t LIST = 9;
const uint8_t COMPOUND = 10; const uint8_t COMPOUND = 10;
const uint8_t INT32_ARRAY= 11; const uint8_t INT32_ARRAY= 11;
const uint8_t INT64_ARRAY= 12; const uint8_t INT64_ARRAY= 12;
// This is a workaround that's not part of the spec.
const uint8_t INVALID = 255;
// This class is used as a placeholder for implementing the end tag.
class End {};
} }
//Generic parent class to make declaration easier // generic class that all tag types are derived from
template <typename T> template <typename T>
class Tag{ struct Tag {
public: const uint8_t type = TagType::INVALID;
uint8_t tagType; T* containedData;
tiny_utf8::string name;
uint16_t nameSize;
T content;
int32_t size;
Tag(){} Tag();
Tag(uint8_t tagType, tiny_utf8::string name, uint16_t nameSize, T content, uint32_t size); ErrorOr<std::vector<uint8_t>> toRawData();
};
class End: public Tag<uint8_t>{
public:
End();
};
class Byte: public Tag<int8_t>{
public:
Byte(tiny_utf8::string name, uint16_t nameSize, int8_t content);
Byte(uint8_t data[]);
bool validate(uint8_t data[]);
}; };
bool validateRawNBTData(uint8_t data[], uint64_t dataSize, uint64_t initialPosition=0, uint64_t* processedDataSize=nullptr); bool validateRawNBTData(uint8_t data[], uint64_t dataSize, uint64_t initialPosition=0, uint64_t* processedDataSize=nullptr);